How do you know if your sidewalk chalk is toxic?

Sidewalk chalk is used by children and adults alike for writing and drawing on sidewalks and driveways. Although most chalk is essentially harmless, there is always the potential for contamination from heavy metals and other harmful substances. While it is best to avoid using chalk that is not specifically labeled as non-toxic, there are a few tell-tale signs that your sidewalk chalk may be toxic.

1. Chalk dust. Toxic chalk will often produce a noticeable amount of chalk dust when you write with it. This chalk dust can irritate your eyes, nose, and throat if inhaled, and it may also be harmful if swallowed.

2. Colouring. Toxic sidewalk chalk may have an unusually bright colour that is not common in natural chalk. This is often a sign that the chalk has been dyed with synthetic dyes that can be harmful to your health.

3. Smell. Toxic chalk may emit an unpleasant smell that is similar to burning rubber or chemicals. This is a sure sign that the chalk contains harmful substances that you should avoid.

4. Labeling. Chalk that is not specifically labeled as non-toxic should be avoided. This is especially important if you are using the chalk around children, as they are most susceptible to the harmful effects of toxic substances.

If you suspect that your sidewalk chalk is toxic, you should immediately stop using it and discard it properly. You should also consult a doctor if you have any concerns about your health after using toxic chalk.